Pressure recording device



April 27, 1937- H. D. WILDE. JR

PRESSURE RECORDING DEVICE Filed Dec. 21, 1931 l l l 3 \MW. 2

I Patented Apr. 27, 1937 UNITED STATES PATENT OFFICE PRESSURE RECORDINGDEVICE Henry D. Wilde, Jr., Houston, Tex., assignor to Standard OilDevelopment Company, a corporation of Delaware Application December 21,1931, Serial No. 582,331 3 Claims. (Cl. 234-20) This invention relatesto improvements in a revolution whenevera pressure reading is degaugedevices such as are used for measuring the sired, whereby the stylusdraws a short line upon pressure at the bottom of an oil well. The inthepaper and the distance between this line and vention will be fullyunderstood from the followa base line drawn on the chart when thepressure ing description taken in connection with the 210- in the springcontaining chamber is atmospheric companying drawing in which latter isa measure of the pressure at the time the Fig. l is a longitudinalsectional view of a fluid recording drum is rotated. The recording drumtight recording chamber of a well pressure gauge. is mounted upon ashaft 6 which in turn is ro- Fig. 2 is a longitudinal sectional view ofthe tatably supported by ball bearings l and 8. A

spring containing chamber of the well pressure bearing case l2 s pp theb bearing 8 nd 1 gauge. is secured in position against a shoulder l2"Fig. 3 is a transverse sectional view taken Within the casing 5 alongthe line 33 of Fig. 1. The recording drum shaft 6 is driven in rota-Fig. 4 is a transverse sectional view taken along tion y means Of a mainSpring which -6- the lin 4 4 f Fig, 1, tuates an escapement shaft l5.Escapement 1 Fig. 5 is a transverse sectional view taken shaft 15 i r lys pp r at i pp along the line 5-5 of Fig. 1. ends in bearing case I2 andplate 16. The end Fig. 6 is a perspective view of the contents of of theshaft 15 nd n th u h earin case th recording h b r, d I2 drives therecording drum shaft 6. A housing Fig. 7 is a transverse sectional viewtaken along l8 extends m the in a 12 to t e pla 2 the line 11 of Fig. 2.l6. Escapement frame rods I9 extend from the Referring particularly tothe drawing, a casbearing case l2 to the plate l6 and support the ingfor a well pressure gauge is shown comprising main spring M. Anescapement wheel 20 is fixed a section A which constitutes a closed-inrecordto the escapement shaft 5 and rotates With the ing chamber and asection B which constitutes shaft. The tension of the main spring l4tends 2 a spring containing chamber opening to the atto ly drive t ecoin drum 2 and 65- mosphere. Sections A and B are united at theireapement wheel 20 in rotation. adjoining ends by means of a wall or plu(3 Rotation of the recording drum and escapewhich has screw threadedengagement with the ment Wheel is normally prevented y me n of asections. The recording chamber is closed at latching device including epe e t s ps 2! E opposite ends by means of a nose plug l and the and 23which are carried by an escapement p plug C whereby the contents of therecording rod 24. Escapement stops 22 and 23 project from chamber aremaintained at any desired presthe escap p rod a an angle of app suresuch as atmospheric pressure. The recordmately 45 degrees to each otherand are spaced ing section contains a cylindrical recording drumlongitudinally of the stop rod. The escapement 2 which is mounted forrotation within the casop rod i m un d f r r cip n m vement ing and isdriven by suitable mechanism to b transversely of the plate l6 andbearing case l2. later' described. A stylus 3 engages recording Th ecapement stop rod projects throu h the material disposed upon the innersurface of the p e and terminates in a 1100K ap D l cylindrical drum 2and records the difference tion 26. The escapement stop rod is normally1 in pressure between the interior of the chamber maintained in positionwith stop 23 engagin a B and the interior of the recording chamber A.teeth of the escapement W el 0 y m a f The stylus is suitably supportedby a mechanism a hel l pring. 2' which is secured at one end to be laterdescribed for movement parallel with through a hole in Plate and s se edat its 45 the longitudinal axis of the casing to record pp end to theescapement p 10d variations in the relative pressures of the fluidEscapement stop rod 24 is drawn downwardly contents of the chambers. Thepressure gauge to disengage stop 23 from the escapement wheel isparticularly adapted for use in a vertical posi- 20 and permit rotationof the recording drum tion such as in an oil well or the like and is bymeans of a weight which is suspended for 50 suspended by means of a cord3 and plate 4. vertical oscillation by means ofa; helical spring i Theposition of the stylus is recorded by means 3| from the plate i6. Spacerrods 32 extend from of a line formed by the stylus upon the recordingthe plate I6 through the weight 30 and are sepaper and extending atright angles to the loncured to a base 34. A U shaped rod 35 projectsgitudinal axis of the recording drum. The re upwardly from the weight 30in position to en- 5 cording drum is driven in rotation a fraction ofgage with he hooked portion 26 of the escapement rod upon downwardmovement of the weight. An adjustable stop 31 threaded into'the casingmaintains the assembly in position.

The-entire instrument is suspended on the wire 5 line 3' and is loweredby means of this line to the bottom of an oil well or to whatever depthat which a pressure measurement is desired. The spring 3! suspending theweight 30 is suificiently strong so that the acceleration anddeceleration of the instrument incident to running it in the well is notsuflicient to cause the weight to reach the bottom or its travel andtrip the escapement. When it is desired to turn the chart and get areading of the instrument, the instrument is allowed to fall free for ashort distance and its fall suddenly checked. This jerking is suflicientto cause the weight 30 to travel the full distance and trip theescapement, thereby rotating the chart a definite fraction of arevolution.

As the weight 30 approaches its bottom position, it pulls down theescapement stop rod 24 a distance sufiicient to release the stop 23 fromengagement with the toothed wheel 20, and suflicient to bring the stop22 into the path of the teeth of the wheel 20.

During this interval, the spring l4 ;rotates the wheel 20 one notchuntil the next tooth engages and is stopped by the stop 22. With thereturn of the weight to its initial position, spring 21 30 now moves therod 24 to its initial position and the stop 23 engages with the lastmentioned tooth. This procedure is repeated during succeeding strokes ofthe weight 30.

The stylus is moved in the casing parallel with the longitudinal axis ofthe casing to record the difference in pressure between the contents ofthe spring-containing or open chamber B and the recording or closedchamber A. The stylus is supported by a piston which extends slidablythrough a packing gland 4| in the plug C into the open chamber B of thecasing. The packing gland 4| permits free longitudinal reciprocatingmovement of the piston 40 while preventing fluid communication betweenthe chambers A and B. The piston 40 is suspended by one end of a helicalspring 42 some of the helical coils of which grip the head of the pistonand the opposite end of which is in turn supported in fixed position bymeans of a washer 43. The washer 43 rests on a shoulder 44 whichprotrudes into the inner surface of the open chamber. A ball bearingguide 45 is attached to the end of the piston 40 adjoining the spring 42and functions to keep the piston at all times in line with thelongitudinal axis of the instrument whereby it can be reciprocatedfreely through the packing gland 4|. The interior of the open chambercommunicates with the atmosphere through an opening 41 in the side wallsof the casing. The pressure to be measured is transmitted into the openchamber through the opening 41, through an opening 48 in plate 4,opening 49, and openings 50 in washer 43 and between the ball bearingsand the guide 45 into position to bear against the piston 40. Thepressure upon the piston 40 tends to force the piston out of the chamberthrough the packing gland 4! until the tension in the spring 42 balancesthe forces tending to push the piston out. The distance which the pistonhas travelled is a measure of the difference in pressure within the openchamber B and the closed or recording chamber A. Before running theinstrument in a well the open chamber is filledgwith liquid such asclean lubricating oil whereby the possibility of the entrance of dirt,grit and the like into the open chamber is reduced.

-Vari0us changes may be made within the scope of the appended claims inwhich it is desired to claim all novelty inherent in the invention asbroadly as the prior art permits.

I claim:

1. A gauge device, comprising a casing having a closed chamber and achamber opening to the atmosphere, a wall separating the chambers, rec-0rd receiving means disposed in the closed chamber, marking meansextending slidably from the open chamber through the wall in fluid tightrelation with respect to the wall into engagement with the recordreceiving means and spring means in the open chamber suspending themarking means whereby variation in fluid pressure within the openchamber alters the position of the marking means with respect to therecord receiving means.

2. A gauge device, comprising a casing having a closed chamber and achamber opening to the atmosphere through an opening in its side wall,the open chamber containing liquid, a wall separating the chambers,record receiving means disposed in the closed chamber, marking meansextending slidably from the open chamber through the wall in fluid tightrelation with respect to the wall into engagement with the recordreceiving means, and spring means in the open chamber suspending themarking means whereby variation in fluid pressure within the openchamber alters the position of the marking means with respect to therecord receiving means.

3. A gauge device, comprising a casing having a closed chamber and achamber opening to the atmosphere, a wall separating the chambers,record receiving means disposed in the closed chamber, a stylus in theclosed chamber engaging the record receiving means, a piston associatedwith the stylus extending through the wall in fluid tight relation withrespect to the wall from the open chamber into the closed chamber, ahelical spring in the open chamber attached at one end to the wall ofthe chamber and at its other end suspending the piston whereby variationin fluid pressure within the open chamber alters the position of thestylus with respect to the record receiving means.

HENRY D. WILDE, JR.

